XmlWriter與命名空間和.WriteNode（）

Question

我正在寫一些代碼，將創建一個Excel .xml文件。該文件是高度結構化的，並以一種不變的方式進行格式化，所以有大約3000行文件不會改變。在看到this question的回答後，我採用了這個解決方案來創建文件。

的代碼如下

XmlWriterSettings writerSettings = new XmlWriterSettings(); 
writerSettings.Indent = true; 
XmlWriter writer = XmlWriter.Create("results.xml", writerSettings); 

writer.WriteStartDocument(); 
writer.WriteProcessingInstruction("mso-application", "progid=\"Excel.Sheet\""); 
writer.WriteStartElement("Workbook", "urn:schemas-microsoft-com:office:spreadsheet"); 
writer.WriteAttributeString("xmlns", "o", null, "urn:schemas-microsoft-com:office:office"); 
writer.WriteAttributeString("xmlns", "x", null, "urn:schemas-microsoft-com:office:excel"); 
writer.WriteAttributeString("xmlns", "ss", null, "urn:schemas-microsoft-com:office:spreadsheet"); 
writer.WriteAttributeString("xmlns", "html", null, "http://www.w3.org/TR/REC-html40"); 
string str = "<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\">\n <Author>Bananal</Author>\n <LastAuthor>PedroK</LastAuthor>\n <LastPrinted>2013-08-01T22:10:44Z</LastPrinted>\n <Created>2013-07-17T21:18:47Z</Created>\n <LastSaved>2013-12-16T17:44:10Z</LastSaved>\n <Version>14.00</Version>\n </DocumentProperties>"; 
XmlReaderSettings readerSettings = new XmlReaderSettings(); 
readerSettings.IgnoreWhitespace = true; 
XmlReader reader = XmlReader.Create(new StringReader(str), readerSettings); 
writer.WriteNode(reader, true); 
str = "<OfficeDocumentSettings xmlns=\"urn:schemas-microsoft-com:office:office\">\n <AllowPNG/>\n </OfficeDocumentSettings>"; 
reader = XmlReader.Create(new StringReader(str), readerSettings); 
writer.WriteNode(reader, true); 
str = "<ExcelWorkbook xmlns=\"urn:schemas-microsoft-com:office:excel\">\n <WindowHeight>12432</WindowHeight>\n <WindowWidth>23256</WindowWidth>\n <WindowTopX>0</WindowTopX>\n <WindowTopY>0</WindowTopY>\n <TabRatio>755</TabRatio>\n <ActiveSheet>9</ActiveSheet>\n <ProtectStructure>False</ProtectStructure>\n <ProtectWindows>False</ProtectWindows>\n </ExcelWorkbook>"; 
reader = XmlReader.Create(new StringReader(str), readerSettings); 
writer.WriteNode(reader, true); 
str = "<Styles>\n <Style ss:ID=\"Default\" ss:Name=\"Normal\">\n <Alignment ss:Vertical=\"Bottom\"/>\n <Borders/>\n <Font ss:FontName=\"Calibri\" x:Family=\"Swiss\" ss:Size=\"11\" ss:Color=\"#000000\"/>\n <Interior/>\n <NumberFormat/>\n <Protection/>\n </Style></Styles>" 
reader = XmlReader.Create(new StringReader(str), readerSettings); 
writer.WriteNode(reader, true); 

這樣，我已經儘可能有效地我能想到的一切批處理。這個效果很好，直到最後一段（關於<Styles>），其中writer.WriteNode()引發異常說'ss' is an undeclared namespace.我對命名空間的定義做了一些錯誤，還是有其他的東西我必須處理原始字符串以使其與.WriteNode() ？

Answer 1

如果您使用XML閱讀器，則提供的xml必須有效。如果在屬性或元素上使用名稱空間別名，則還需要限定名稱空間。

快速修復方案
你要添加的命名空間ss和x你的風格標籤，像這樣：

str = "<Styles xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\" xmlns:x=\"urn:schemas-microsoft-com:office:excel\">\n <Style ss:ID=\"Default\" ss:Name=\"Normal\">\n <Alignment ss:Vertical=\"Bottom\"/>\n <Borders/>\n <Font ss:FontName=\"Calibri\" x:Family=\"Swiss\" ss:Size=\"11\" ss:Color=\"#000000\"/>\n <Interior/>\n <NumberFormat/>\n <Protection/>\n </Style></Styles>"; 
reader = XmlReader.Create(new StringReader(str), readerSettings); 
writer.WriteNode(reader, true); 

替代解決方案
提供必要給讀者的命名空間一個parserContext 。優點是你不必改變你現在擁有的xmlmarkup。

NameTable nt = new NameTable(); 
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt); 
nsmgr.AddNamespace("ss", "urn:schemas-microsoft-com:office:spreadsheet"); 
nsmgr.AddNamespace("x", "urn:schemas-microsoft-com:office:excel"); 

//Create the XmlParserContext (this can be reused in every reader!) 
XmlParserContext ctx = new XmlParserContext(null, nsmgr, null, XmlSpace.None); 

/* other code here */ 

str = "<Styles >\n <Style ss:ID=\"Default\" ss:Name=\"Normal\">\n <Alignment ss:Vertical=\"Bottom\"/>\n <Borders/>\n <Font ss:FontName=\"Calibri\" x:Family=\"Swiss\" ss:Size=\"11\" ss:Color=\"#000000\"/>\n <Interior/>\n <NumberFormat/>\n <Protection/>\n </Style></Styles>"; 
reader = XmlReader.Create(new StringReader(str), readerSettings, ctx); // NOTICE ctx here 
writer.WriteNode(reader, true); 

旁註
看起來你是生產用於通過Excel中使用的文件。你認爲The Open XML SDK？